One faction with huge disadvantage in late game, is asymetrical ballance.
Simply play axis in large team games as we all.
That argument had any base before latest patch, where you could field multiple heavies.
Right now, it doesn't as jacksons and multiple shermans are enough to deal with single heavy.
That's interesting, especially because it goes against the current rules of mobile artillery, which are generally fragile units. The most durable being the Stuka and Priest. Yet this is a Medium Tank with long-range rockets attached.
StuKa zu fuss and priest already go against it as you've mentioned.
Scott also doesn't hold to the principle of katy/pwerfer firmly.
I could argue sturmtiger as well, while not particularly long ranges, its still a mobile arty.
There is also a KV-2 crying somewhere in a dark, forgotten corner.
There is plenty of room for improvement.